Personal air filter



FIG. 1 is a front elevational view of a personal air filter showing my new design;

FIG. 2 is a rear elevational view thereof;

FIG. 3 is a left side view thereof;

FIG. 4 is a right side view thereof;

FIG. 5 is a top plan view thereof;

FIG. 6 is a bottom plan view thereof;

FIG. 7 is a top perspective view thereof;

FIG. 8 is a bottom perspective view thereof;

FIG. 9 is a bottom perspective view showing the personal air filter in a disassembled state;

FIG. 10 is a top perspective view showing the personal air filter in a disassembled state; and,

FIG. 11 is an enlarged view of portion 11 in FIG. 9.

The broken lines in the drawings illustrate portions of the personal air filter which form no part of the claimed design. 

CLAIM The ornamental design for a personal air filter, as shown and described. 